10/100/1000 ports, Sfp module slots – Cisco 3030 User Manual

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Cisco Catalyst Blade Switch 3030 Hardware Installation Guide


Chapter 1 Product Overview

Front Panel Description

10/100/1000 Ports

The two copper Ethernet ports operate at 10, 100, or 1000 Mbps and support autonegotiation and
full-duplex operation. When set for autonegotiation, the port senses the speed and duplex settings of the
attached device and advertises its own capabilities. If the connected device also supports
autonegotiation, the switch port negotiates the best connection (that is, the fastest line speed that both
devices support and full-duplex transmission if the attached device supports it) and configures itself
accordingly. In all cases, the attached device must be within 328 feet (100 meters).

You can disable autonegotiation for the two 10/100/1000BASE-T ports by using the Cisco IOS
command-line interface (CLI). For more information, see the command reference and the software
configuration guide for the switch.

The ten internal downlink ports are 1000BASE-X with no negotiation for speed.


1000BASE-T traffic requires at least a Category 5 cable. 10BASE-T traffic can use Category 3 or
Category 4 cables.

When connecting the switch to workstations, servers, routers, and Cisco IP Phones, be sure that the cable
is a straight-through cable. When you connect the switch to switches or hubs, use a crossover cable.
When you use a straight-through or crossover cable for 1000BASE-T connections, be sure to use a
twisted four-pair, Category 5 cable for proper operation. Pinouts for the cables are described in

Appendix B, “Connector and Cable Specifications.”


You can use the mdix auto interface configuration command in the CLI to enable the automatic
medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is enabled,
the switch detects the required cable type for copper Ethernet connections and configures the interfaces
accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a
copper 10/100/1000 or 1000BASE-T SFP module port on the switch, regardless of the type of device on
the other end of the connection.

The auto-MDIX feature is enabled by default. For configuration information for this feature, refer to the
switch software configuration guide or the switch command reference.

SFP Module Slots

The switch uses Gigabit Ethernet SFP modules to establish fiber-optic connections. These transceiver
modules are field-replaceable, providing the uplink interfaces when inserted in an SFP module slot. You
can use the SFP modules for Gigabit uplink connections to other switches. You use fiber-optic cables
with LC or MT-RJ connectors to connect to a fiber-optic SFP module. You use Category 5 cable with
RJ-45 connectors to connect to a copper SFP module.

The four external SFP module ports operate at 1000 Mbps when fiber-optic SFP modules are installed
and operate at 10/100/1000 Mbps when copper SFP modules are installed. Autonegotation is supported
on copper SPF modules, but not on fiber-optic SFP modules.

See the release notes for the latest information about which SFP module types are supported.

For more information about the SFP modules, refer to your SFP module documentation.